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By Stephen P. Wilkinson (auth.), M. Y. Hussaini, A. Kumar, C. L. Streett (eds.)

ISBN-10: 1461229561

ISBN-13: 9781461229568

ISBN-10: 1461277329

ISBN-13: 9781461277323

This quantity includes the complaints of the Workshop on In­ balance, Transition and Turbulence, backed via the Institute for machine purposes in technological know-how and Engineering (ICASE) and the NASA Langley study middle (LaRC), in the course of July eight to August 2, 1991. this can be the second one workshop within the sequence at the topic. the 1st was once held in 1989, and its court cases have been released via Springer-Verlag lower than the identify "Instability and Transition" edited by way of M. Y. Hussaini and R. G. Voigt. The goals of those paintings­ retailers are to i) disclose the tutorial neighborhood to present technologically im­ portant problems with transition and turbulence in shear flows over the complete velocity diversity, ii) acquaint the educational neighborhood with the original mix of theoretical, computational and experimental services at LaRC and foster interplay with those features, and iii) speed up growth in elucidating the basic phenomena of transition and turbulence, resulting in enhanced transition and turbulence modeling in layout methodologies. The examine parts lined in those complaints comprise receptiv­ ity and roughness, nonlinear theories of transition, numerical simu­ lation of spatially evolving flows, modelling of transitional and entirely turbulent flows in addition to a few experiments on instability and tran­ sition. furthermore a one-day mini-symposium used to be held to debate 1 contemporary and deliberate experiments on turbulent movement over a backward­ dealing with step.

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Disk rotation is counter clockwise. ) S :::> '-.... 11 2080 6 12 18 24 Azimuthal Wave No. 30 Figure 4. Development of azimuthal velocity spectra in radial direction for unforced conditions. 00 Disk Rotations Figure 5. Development of velocity time series in radial direction corresponding to spectra in Figure 4. 0 Re Figure 6. 0 '6 I- 0 0 6 0 00 00 A4 00'l. 0 f- 0 00 o'l. u'(max) Figure 7. Eigenfunction modulus in the wall normal direction for three dominant cross flow modes at R = 232. 0 .... 8.

The boundary layer is entrained into the free shear layer that forms between the jet flow and the recirculating flow. The shear layer reattaches to the wall some distance downstream of the step and evolves into a new turbulent boundary layer. A wide range of velocities is present in the flow with reversed velocities approaching 25 percent of the freestream in the recirculating flow. These flow features produce a wide range of turbulent time and length scales which makes prediction of the reattachment location difficult.

Materials of the workshop held May 15 - June 9,1989 in Hampton, Virginia. , 1991, Gortler Instability and Hypersonic Quiet Nozzle Design. Paper 91-1648, AIAA. , 1981, Roughness effects on boundary-layer transition in a nozzle throat. AIAA Journal, 19:282-289. , 1990, Investigation of the Influence of Constant Adverse Pressure Gradients on Laminar Boundary-Layer Stability at Mach Number 8. Technical Report AEDC-TSR-90-V13, AEDC. Work done in conjunction with Roger Kimmel and Ken Stetson at Wright Patterson.

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Instability, Transition, and Turbulence by Stephen P. Wilkinson (auth.), M. Y. Hussaini, A. Kumar, C. L. Streett (eds.)

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